<?php
/**
 * Smarty Internal Plugin Compile Assign
 *
 * Compiles the {assign} tag
 *
 * @package Smarty
 * @subpackage Compiler
 * @author Uwe Tews
 */

/**
 * Smarty Internal Plugin Compile Assign Class
 *
 * @package Smarty
 * @subpackage Compiler
 */
class Smarty_Internal_Compile_Assign extends Smarty_Internal_CompileBase {
	
	/**
	 * Compiles code for the {assign} tag
	 *
	 * @param $args array
	 *       	 array with attributes from parser
	 * @param $compiler object
	 *       	 compiler object
	 * @param $parameter array
	 *       	 array with compilation parameter
	 * @return string compiled code
	 */
	public function compile($args, $compiler, $parameter) {
		// the following must be assigned at runtime because it will be
		// overwritten in Smarty_Internal_Compile_Append
		$this->required_attributes = array ('var', 'value' );
		$this->shorttag_order = array ('var', 'value' );
		$this->optional_attributes = array ('scope' );
		$_nocache = 'null';
		$_scope = Smarty::SCOPE_LOCAL;
		// check and get attributes
		$_attr = $this->getAttributes ( $compiler, $args );
		// nocache ?
		if ($compiler->tag_nocache || $compiler->nocache) {
			$_nocache = 'true';
			// create nocache var to make it know for further compiling
			$compiler->template->tpl_vars [trim ( $_attr ['var'], "'" )] = new Smarty_variable ( null, true );
		}
		// scope setup
		if (isset ( $_attr ['scope'] )) {
			$_attr ['scope'] = trim ( $_attr ['scope'], "'\"" );
			if ($_attr ['scope'] == 'parent') {
				$_scope = Smarty::SCOPE_PARENT;
			} elseif ($_attr ['scope'] == 'root') {
				$_scope = Smarty::SCOPE_ROOT;
			} elseif ($_attr ['scope'] == 'global') {
				$_scope = Smarty::SCOPE_GLOBAL;
			} else {
				$compiler->trigger_template_error ( 'illegal value for "scope" attribute', $compiler->lex->taglineno );
			}
		}
		// compiled output
		if (isset ( $parameter ['smarty_internal_index'] )) {
			$output = "<?php \$_smarty_tpl->createLocalArrayVariable($_attr[var], $_nocache, $_scope);\n\$_smarty_tpl->tpl_vars[$_attr[var]]->value$parameter[smarty_internal_index] = $_attr[value];";
		} else {
			$output = "<?php \$_smarty_tpl->tpl_vars[$_attr[var]] = new Smarty_variable($_attr[value], $_nocache, $_scope);";
		}
		if ($_scope == Smarty::SCOPE_PARENT) {
			$output .= "\nif (\$_smarty_tpl->parent != null) \$_smarty_tpl->parent->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
		} elseif ($_scope == Smarty::SCOPE_ROOT || $_scope == Smarty::SCOPE_GLOBAL) {
			$output .= "\n\$_ptr = \$_smarty_tpl->parent; while (\$_ptr != null) {\$_ptr->tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]]; \$_ptr = \$_ptr->parent; }";
		}
		if ($_scope == Smarty::SCOPE_GLOBAL) {
			$output .= "\nSmarty::\$global_tpl_vars[$_attr[var]] = clone \$_smarty_tpl->tpl_vars[$_attr[var]];";
		}
		$output .= '?>';
		return $output;
	}

}

?>